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The rigid bar ABC, initially horizontal, is pin- supported at B, connected to a shear spring at A, and welded to an aluminum bar at C. The shear spring is composed of two rubbers (G=87 psi) pads (with dimensions a × b × c) thatare glued to a Valyrian steel (E = 10100 psi) plate (with dimensions 0.5a x 2b × c). Whenthe temperature of the aluminum bar at C changes by AT, determine the normal stress. a rubber pad B Aluminum bar L = 1.5 ft A = 1 in² E = 10 000 ksi www α = 12.8 x 10-6/°F A Valyrian steel plate Use the following values: a = 2.7 in b = 3.2 in c = 3.9 in AT 289 °F, cooling = x = 3 ft y = 3 ft